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Comment

If you have two pumps going to one water heater it seems logical that they feed separately to as close to the water heater as possible. If you tie the lines together then why 2 have two pumps? Just use one more powerful unit.

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if you have two return lines, and tie them into one pump, how do you ensure that you're getting flow out of Both lines? When roughing a house in I always make it with one return line, I suppose because I just don't understand enough about dividing them to avoid needing more than 1 pump.

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I've always tied them in separate, but a question came up on a punch list saying I had them wrong. No one can tell me why they should be tied together before tying back into the cold feed to the heater.

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How about some more information, is this residential or commercial? Are these pumps for two entirely separate loops? How big is this system? Give us an idea of how many fixtures. How long is the return piping from the furthest fixture and what size is it. A picture would really be nice.